Add missing using statements for JNI types.

content/common/android/media_metadata_android.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/common/android/media_metadata_android.h"
 
 #include <string>
 #include <vector>
 
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "content/public/common/media_metadata.h"
 #include "jni/MediaMetadata_jni.h"
 
+using base::android::ScopedJavaLocalRef;
+
 namespace content {
 
 namespace {
 
 std::vector<int> GetFlattenedSizeArray(const std::vector<gfx::Size>& sizes) {
   std::vector<int> flattened_array;
   flattened_array.reserve(2 * sizes.size());
   for (const auto& size : sizes) {
     flattened_array.push_back(size.width());
     flattened_array.push_back(size.height());
@@ skipping 30 matching lines @@
             env, GetFlattenedSizeArray(artwork.sizes)));
 
     Java_MediaMetadata_createAndAddArtwork(
         env, j_metadata.obj(), j_src.obj(), j_type.obj(), j_sizes.obj());
   }
 
   return j_metadata;
 }
 
 }  // namespace content